@@ -448,8 +448,9 @@ struct btrfs_space_info {
#define BTRFS_BLOCK_RSV_TRANS 3
#define BTRFS_BLOCK_RSV_CHUNK 4
#define BTRFS_BLOCK_RSV_DELOPS 5
-#define BTRFS_BLOCK_RSV_EMPTY 6
-#define BTRFS_BLOCK_RSV_TEMP 7
+#define BTRFS_BLOCK_RSV_DELREFS 6
+#define BTRFS_BLOCK_RSV_EMPTY 7
+#define BTRFS_BLOCK_RSV_TEMP 8
struct btrfs_block_rsv {
u64 size;
@@ -812,6 +813,8 @@ struct btrfs_fs_info {
struct btrfs_block_rsv chunk_block_rsv;
/* block reservation for delayed operations */
struct btrfs_block_rsv delayed_block_rsv;
+ /* block reservation for delayed refs */
+ struct btrfs_block_rsv delayed_refs_rsv;
struct btrfs_block_rsv empty_block_rsv;
@@ -2796,6 +2799,13 @@ int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
struct btrfs_block_rsv *block_rsv,
u64 num_bytes);
+void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr);
+void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans);
+int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
+ enum btrfs_reserve_flush_enum flush);
+void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *src,
+ u64 num_bytes);
int btrfs_inc_block_group_ro(struct btrfs_block_group_cache *cache);
void btrfs_dec_block_group_ro(struct btrfs_block_group_cache *cache);
void btrfs_put_block_group_cache(struct btrfs_fs_info *info);
@@ -474,11 +474,14 @@ static int insert_delayed_ref(struct btrfs_trans_handle *trans,
* existing and update must have the same bytenr
*/
static noinline void
-update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
+update_existing_head_ref(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_head *existing,
struct btrfs_delayed_ref_head *update,
int *old_ref_mod_ret)
{
+ struct btrfs_delayed_ref_root *delayed_refs =
+ &trans->transaction->delayed_refs;
+ struct btrfs_fs_info *fs_info = trans->fs_info;
int old_ref_mod;
BUG_ON(existing->is_data != update->is_data);
@@ -536,10 +539,18 @@ update_existing_head_ref(struct btrfs_delayed_ref_root *delayed_refs,
* versa we need to make sure to adjust pending_csums accordingly.
*/
if (existing->is_data) {
- if (existing->total_ref_mod >= 0 && old_ref_mod < 0)
+ u64 csum_leaves =
+ btrfs_csum_bytes_to_leaves(fs_info,
+ existing->num_bytes);
+
+ if (existing->total_ref_mod >= 0 && old_ref_mod < 0) {
delayed_refs->pending_csums -= existing->num_bytes;
- if (existing->total_ref_mod < 0 && old_ref_mod >= 0)
+ btrfs_delayed_refs_rsv_release(fs_info, csum_leaves);
+ }
+ if (existing->total_ref_mod < 0 && old_ref_mod >= 0) {
delayed_refs->pending_csums += existing->num_bytes;
+ trans->delayed_ref_updates += csum_leaves;
+ }
}
spin_unlock(&existing->lock);
}
@@ -645,7 +656,7 @@ add_delayed_ref_head(struct btrfs_trans_handle *trans,
&& head_ref->qgroup_reserved
&& existing->qgroup_ref_root
&& existing->qgroup_reserved);
- update_existing_head_ref(delayed_refs, existing, head_ref,
+ update_existing_head_ref(trans, existing, head_ref,
old_ref_mod);
/*
* we've updated the existing ref, free the newly
@@ -656,8 +667,12 @@ add_delayed_ref_head(struct btrfs_trans_handle *trans,
} else {
if (old_ref_mod)
*old_ref_mod = 0;
- if (head_ref->is_data && head_ref->ref_mod < 0)
+ if (head_ref->is_data && head_ref->ref_mod < 0) {
delayed_refs->pending_csums += head_ref->num_bytes;
+ trans->delayed_ref_updates +=
+ btrfs_csum_bytes_to_leaves(trans->fs_info,
+ head_ref->num_bytes);
+ }
delayed_refs->num_heads++;
delayed_refs->num_heads_ready++;
atomic_inc(&delayed_refs->num_entries);
@@ -793,6 +808,12 @@ int btrfs_add_delayed_tree_ref(struct btrfs_trans_handle *trans,
ret = insert_delayed_ref(trans, delayed_refs, head_ref, &ref->node);
spin_unlock(&delayed_refs->lock);
+ /*
+ * Need to update the delayed_refs_rsv with any changes we may have
+ * made.
+ */
+ btrfs_update_delayed_refs_rsv(trans);
+
trace_add_delayed_tree_ref(fs_info, &ref->node, ref,
action == BTRFS_ADD_DELAYED_EXTENT ?
BTRFS_ADD_DELAYED_REF : action);
@@ -874,6 +895,12 @@ int btrfs_add_delayed_data_ref(struct btrfs_trans_handle *trans,
ret = insert_delayed_ref(trans, delayed_refs, head_ref, &ref->node);
spin_unlock(&delayed_refs->lock);
+ /*
+ * Need to update the delayed_refs_rsv with any changes we may have
+ * made.
+ */
+ btrfs_update_delayed_refs_rsv(trans);
+
trace_add_delayed_data_ref(trans->fs_info, &ref->node, ref,
action == BTRFS_ADD_DELAYED_EXTENT ?
BTRFS_ADD_DELAYED_REF : action);
@@ -910,6 +937,12 @@ int btrfs_add_delayed_extent_op(struct btrfs_fs_info *fs_info,
NULL, NULL, NULL);
spin_unlock(&delayed_refs->lock);
+
+ /*
+ * Need to update the delayed_refs_rsv with any changes we may have
+ * made.
+ */
+ btrfs_update_delayed_refs_rsv(trans);
return 0;
}
@@ -2666,6 +2666,9 @@ int open_ctree(struct super_block *sb,
btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY);
btrfs_init_block_rsv(&fs_info->delayed_block_rsv,
BTRFS_BLOCK_RSV_DELOPS);
+ btrfs_init_block_rsv(&fs_info->delayed_refs_rsv,
+ BTRFS_BLOCK_RSV_DELREFS);
+
atomic_set(&fs_info->async_delalloc_pages, 0);
atomic_set(&fs_info->defrag_running, 0);
atomic_set(&fs_info->qgroup_op_seq, 0);
@@ -4413,6 +4416,7 @@ void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans,
spin_unlock(&cur_trans->dirty_bgs_lock);
btrfs_put_block_group(cache);
+ btrfs_delayed_refs_rsv_release(fs_info, 1);
spin_lock(&cur_trans->dirty_bgs_lock);
}
spin_unlock(&cur_trans->dirty_bgs_lock);
@@ -2462,6 +2462,7 @@ static void cleanup_ref_head_accounting(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_delayed_ref_root *delayed_refs =
&trans->transaction->delayed_refs;
+ int nr_items = 1; /* Dropping this ref head update. */
if (head->total_ref_mod < 0) {
struct btrfs_space_info *space_info;
@@ -2479,16 +2480,24 @@ static void cleanup_ref_head_accounting(struct btrfs_trans_handle *trans,
-head->num_bytes,
BTRFS_TOTAL_BYTES_PINNED_BATCH);
+ /*
+ * We had csum deletions accounted for in our delayed refs rsv,
+ * we need to drop the csum leaves for this update from our
+ * delayed_refs_rsv.
+ */
if (head->is_data) {
spin_lock(&delayed_refs->lock);
delayed_refs->pending_csums -= head->num_bytes;
spin_unlock(&delayed_refs->lock);
+ nr_items += btrfs_csum_bytes_to_leaves(fs_info,
+ head->num_bytes);
}
}
/* Also free its reserved qgroup space */
btrfs_qgroup_free_delayed_ref(fs_info, head->qgroup_ref_root,
head->qgroup_reserved);
+ btrfs_delayed_refs_rsv_release(fs_info, nr_items);
}
static int cleanup_ref_head(struct btrfs_trans_handle *trans,
@@ -3626,6 +3635,8 @@ int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans)
*/
mutex_lock(&trans->transaction->cache_write_mutex);
while (!list_empty(&dirty)) {
+ bool drop_reserve = true;
+
cache = list_first_entry(&dirty,
struct btrfs_block_group_cache,
dirty_list);
@@ -3698,6 +3709,7 @@ int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans)
list_add_tail(&cache->dirty_list,
&cur_trans->dirty_bgs);
btrfs_get_block_group(cache);
+ drop_reserve = false;
}
spin_unlock(&cur_trans->dirty_bgs_lock);
} else if (ret) {
@@ -3708,6 +3720,8 @@ int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans)
/* if its not on the io list, we need to put the block group */
if (should_put)
btrfs_put_block_group(cache);
+ if (drop_reserve)
+ btrfs_delayed_refs_rsv_release(fs_info, 1);
if (ret)
break;
@@ -3856,6 +3870,7 @@ int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
/* if its not on the io list, we need to put the block group */
if (should_put)
btrfs_put_block_group(cache);
+ btrfs_delayed_refs_rsv_release(fs_info, 1);
spin_lock(&cur_trans->dirty_bgs_lock);
}
spin_unlock(&cur_trans->dirty_bgs_lock);
@@ -5389,6 +5404,91 @@ int btrfs_cond_migrate_bytes(struct btrfs_fs_info *fs_info,
return 0;
}
+/**
+ * btrfs_migrate_to_delayed_refs_rsv - transfer bytes to our delayed refs rsv.
+ * @fs_info - the fs info for our fs.
+ * @src - the source block rsv to transfer from.
+ * @num_bytes - the number of bytes to transfer.
+ *
+ * This transfers up to the num_bytes amount from the src rsv to the
+ * delayed_refs_rsv. Any extra bytes are returned to the space info.
+ */
+void btrfs_migrate_to_delayed_refs_rsv(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *src,
+ u64 num_bytes)
+{
+ struct btrfs_block_rsv *delayed_refs_rsv = &fs_info->delayed_refs_rsv;
+ u64 to_free = 0;
+
+ spin_lock(&src->lock);
+ src->reserved -= num_bytes;
+ src->size -= num_bytes;
+ spin_unlock(&src->lock);
+
+ spin_lock(&delayed_refs_rsv->lock);
+ if (delayed_refs_rsv->size > delayed_refs_rsv->reserved) {
+ u64 delta = delayed_refs_rsv->size -
+ delayed_refs_rsv->reserved;
+ if (num_bytes > delta) {
+ to_free = num_bytes - delta;
+ num_bytes = delta;
+ }
+ } else {
+ to_free = num_bytes;
+ num_bytes = 0;
+ }
+
+ if (num_bytes)
+ delayed_refs_rsv->reserved += num_bytes;
+ if (delayed_refs_rsv->reserved >= delayed_refs_rsv->size)
+ delayed_refs_rsv->full = 1;
+ spin_unlock(&delayed_refs_rsv->lock);
+
+ if (num_bytes)
+ trace_btrfs_space_reservation(fs_info, "delayed_refs_rsv",
+ 0, num_bytes, 1);
+ if (to_free)
+ space_info_add_old_bytes(fs_info, delayed_refs_rsv->space_info,
+ to_free);
+}
+
+/**
+ * btrfs_delayed_refs_rsv_refill - refill based on our delayed refs usage.
+ * @fs_info - the fs_info for our fs.
+ * @flush - control how we can flush for this reservation.
+ *
+ * This will refill the delayed block_rsv up to 1 items size worth of space and
+ * will return -ENOSPC if we can't make the reservation.
+ */
+int btrfs_delayed_refs_rsv_refill(struct btrfs_fs_info *fs_info,
+ enum btrfs_reserve_flush_enum flush)
+{
+ struct btrfs_block_rsv *block_rsv = &fs_info->delayed_refs_rsv;
+ u64 limit = btrfs_calc_trans_metadata_size(fs_info, 1);
+ u64 num_bytes = 0;
+ int ret = -ENOSPC;
+
+ spin_lock(&block_rsv->lock);
+ if (block_rsv->reserved < block_rsv->size) {
+ num_bytes = block_rsv->size - block_rsv->reserved;
+ num_bytes = min(num_bytes, limit);
+ }
+ spin_unlock(&block_rsv->lock);
+
+ if (!num_bytes)
+ return 0;
+
+ ret = reserve_metadata_bytes(fs_info->extent_root, block_rsv,
+ num_bytes, flush);
+ if (ret)
+ return ret;
+ block_rsv_add_bytes(block_rsv, num_bytes, 0);
+ trace_btrfs_space_reservation(fs_info, "delayed_refs_rsv",
+ 0, num_bytes, 1);
+ return 0;
+}
+
+
/*
* This is for space we already have accounted in space_info->bytes_may_use, so
* basically when we're returning space from block_rsv's.
@@ -5709,6 +5809,31 @@ static int btrfs_inode_rsv_refill(struct btrfs_inode *inode,
return ret;
}
+static u64 __btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes, u64 *qgroup_to_release)
+{
+ struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
+ struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_refs_rsv;
+ struct btrfs_block_rsv *target = delayed_rsv;
+
+ if (target->full || target == block_rsv)
+ target = global_rsv;
+
+ if (block_rsv->space_info != target->space_info)
+ target = NULL;
+
+ return block_rsv_release_bytes(fs_info, block_rsv, target, num_bytes,
+ qgroup_to_release);
+}
+
+void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
+ struct btrfs_block_rsv *block_rsv,
+ u64 num_bytes)
+{
+ __btrfs_block_rsv_release(fs_info, block_rsv, num_bytes, NULL);
+}
+
/**
* btrfs_inode_rsv_release - release any excessive reservation.
* @inode - the inode we need to release from.
@@ -5723,7 +5848,6 @@ static int btrfs_inode_rsv_refill(struct btrfs_inode *inode,
static void btrfs_inode_rsv_release(struct btrfs_inode *inode, bool qgroup_free)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
- struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
struct btrfs_block_rsv *block_rsv = &inode->block_rsv;
u64 released = 0;
u64 qgroup_to_release = 0;
@@ -5733,8 +5857,8 @@ static void btrfs_inode_rsv_release(struct btrfs_inode *inode, bool qgroup_free)
* are releasing 0 bytes, and then we'll just get the reservation over
* the size free'd.
*/
- released = block_rsv_release_bytes(fs_info, block_rsv, global_rsv, 0,
- &qgroup_to_release);
+ released = __btrfs_block_rsv_release(fs_info, block_rsv, 0,
+ &qgroup_to_release);
if (released > 0)
trace_btrfs_space_reservation(fs_info, "delalloc",
btrfs_ino(inode), released, 0);
@@ -5745,16 +5869,26 @@ static void btrfs_inode_rsv_release(struct btrfs_inode *inode, bool qgroup_free)
qgroup_to_release);
}
-void btrfs_block_rsv_release(struct btrfs_fs_info *fs_info,
- struct btrfs_block_rsv *block_rsv,
- u64 num_bytes)
+/**
+ * btrfs_delayed_refs_rsv_release - release a ref head's reservation.
+ * @fs_info - the fs_info for our fs.
+ * @nr - the number of items to drop.
+ *
+ * This drops the delayed ref head's count from the delayed refs rsv and free's
+ * any excess reservation we had.
+ */
+void btrfs_delayed_refs_rsv_release(struct btrfs_fs_info *fs_info, int nr)
{
+ struct btrfs_block_rsv *block_rsv = &fs_info->delayed_refs_rsv;
struct btrfs_block_rsv *global_rsv = &fs_info->global_block_rsv;
+ u64 num_bytes = btrfs_calc_trans_metadata_size(fs_info, nr);
+ u64 released = 0;
- if (global_rsv == block_rsv ||
- block_rsv->space_info != global_rsv->space_info)
- global_rsv = NULL;
- block_rsv_release_bytes(fs_info, block_rsv, global_rsv, num_bytes, NULL);
+ released = block_rsv_release_bytes(fs_info, block_rsv, global_rsv,
+ num_bytes, NULL);
+ if (released)
+ trace_btrfs_space_reservation(fs_info, "delayed_refs_rsv",
+ 0, released, 0);
}
static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
@@ -5819,9 +5953,10 @@ static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
fs_info->trans_block_rsv.space_info = space_info;
fs_info->empty_block_rsv.space_info = space_info;
fs_info->delayed_block_rsv.space_info = space_info;
+ fs_info->delayed_refs_rsv.space_info = space_info;
- fs_info->extent_root->block_rsv = &fs_info->global_block_rsv;
- fs_info->csum_root->block_rsv = &fs_info->global_block_rsv;
+ fs_info->extent_root->block_rsv = &fs_info->delayed_refs_rsv;
+ fs_info->csum_root->block_rsv = &fs_info->delayed_refs_rsv;
fs_info->dev_root->block_rsv = &fs_info->global_block_rsv;
fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
if (fs_info->quota_root)
@@ -5841,8 +5976,34 @@ static void release_global_block_rsv(struct btrfs_fs_info *fs_info)
WARN_ON(fs_info->chunk_block_rsv.reserved > 0);
WARN_ON(fs_info->delayed_block_rsv.size > 0);
WARN_ON(fs_info->delayed_block_rsv.reserved > 0);
+ WARN_ON(fs_info->delayed_refs_rsv.reserved > 0);
+ WARN_ON(fs_info->delayed_refs_rsv.size > 0);
}
+/*
+ * btrfs_update_delayed_refs_rsv - adjust the size of the delayed refs rsv
+ * @trans - the trans that may have generated delayed refs
+ *
+ * This is to be called anytime we may have adjusted trans->delayed_ref_updates,
+ * it'll calculate the additional size and add it to the delayed_refs_rsv.
+ */
+void btrfs_update_delayed_refs_rsv(struct btrfs_trans_handle *trans)
+{
+ struct btrfs_fs_info *fs_info = trans->fs_info;
+ struct btrfs_block_rsv *delayed_rsv = &fs_info->delayed_refs_rsv;
+ u64 num_bytes;
+
+ if (!trans->delayed_ref_updates)
+ return;
+
+ num_bytes = btrfs_calc_trans_metadata_size(fs_info,
+ trans->delayed_ref_updates);
+ spin_lock(&delayed_rsv->lock);
+ delayed_rsv->size += num_bytes;
+ delayed_rsv->full = 0;
+ spin_unlock(&delayed_rsv->lock);
+ trans->delayed_ref_updates = 0;
+}
/*
* To be called after all the new block groups attached to the transaction
@@ -6135,6 +6296,7 @@ static int update_block_group(struct btrfs_trans_handle *trans,
u64 old_val;
u64 byte_in_group;
int factor;
+ int ret = 0;
/* block accounting for super block */
spin_lock(&info->delalloc_root_lock);
@@ -6148,8 +6310,10 @@ static int update_block_group(struct btrfs_trans_handle *trans,
while (total) {
cache = btrfs_lookup_block_group(info, bytenr);
- if (!cache)
- return -ENOENT;
+ if (!cache) {
+ ret = -ENOENT;
+ break;
+ }
factor = btrfs_bg_type_to_factor(cache->flags);
/*
@@ -6208,6 +6372,7 @@ static int update_block_group(struct btrfs_trans_handle *trans,
list_add_tail(&cache->dirty_list,
&trans->transaction->dirty_bgs);
trans->transaction->num_dirty_bgs++;
+ trans->delayed_ref_updates++;
btrfs_get_block_group(cache);
}
spin_unlock(&trans->transaction->dirty_bgs_lock);
@@ -6225,7 +6390,10 @@ static int update_block_group(struct btrfs_trans_handle *trans,
total -= num_bytes;
bytenr += num_bytes;
}
- return 0;
+
+ /* Modified block groups are accounted for in the delayed_refs_rsv. */
+ btrfs_update_delayed_refs_rsv(trans);
+ return ret;
}
static u64 first_logical_byte(struct btrfs_fs_info *fs_info, u64 search_start)
@@ -8368,7 +8536,12 @@ use_block_rsv(struct btrfs_trans_handle *trans,
goto again;
}
- if (btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
+ /*
+ * The global reserve still exists to save us from ourselves, so don't
+ * warn_on if we are short on our delayed refs reserve.
+ */
+ if (block_rsv->type != BTRFS_BLOCK_RSV_DELREFS &&
+ btrfs_test_opt(fs_info, ENOSPC_DEBUG)) {
static DEFINE_RATELIMIT_STATE(_rs,
DEFAULT_RATELIMIT_INTERVAL * 10,
/*DEFAULT_RATELIMIT_BURST*/ 1);
@@ -10301,6 +10474,7 @@ void btrfs_create_pending_block_groups(struct btrfs_trans_handle *trans)
add_block_group_free_space(trans, block_group);
/* already aborted the transaction if it failed. */
next:
+ btrfs_delayed_refs_rsv_release(fs_info, 1);
list_del_init(&block_group->bg_list);
}
btrfs_trans_release_chunk_metadata(trans);
@@ -10378,6 +10552,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle *trans, u64 bytes_used,
link_block_group(cache);
list_add_tail(&cache->bg_list, &trans->new_bgs);
+ trans->delayed_ref_updates++;
+ btrfs_update_delayed_refs_rsv(trans);
set_avail_alloc_bits(fs_info, type);
return 0;
@@ -10415,6 +10591,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
int factor;
struct btrfs_caching_control *caching_ctl = NULL;
bool remove_em;
+ bool remove_rsv = false;
block_group = btrfs_lookup_block_group(fs_info, group_start);
BUG_ON(!block_group);
@@ -10479,6 +10656,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
if (!list_empty(&block_group->dirty_list)) {
list_del_init(&block_group->dirty_list);
+ remove_rsv = true;
btrfs_put_block_group(block_group);
}
spin_unlock(&trans->transaction->dirty_bgs_lock);
@@ -10688,6 +10866,8 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
ret = btrfs_del_item(trans, root, path);
out:
+ if (remove_rsv)
+ btrfs_delayed_refs_rsv_release(fs_info, 1);
btrfs_free_path(path);
return ret;
}
@@ -454,7 +454,7 @@ start_transaction(struct btrfs_root *root, unsigned int num_items,
bool enforce_qgroups)
{
struct btrfs_fs_info *fs_info = root->fs_info;
-
+ struct btrfs_block_rsv *delayed_refs_rsv = &fs_info->delayed_refs_rsv;
struct btrfs_trans_handle *h;
struct btrfs_transaction *cur_trans;
u64 num_bytes = 0;
@@ -483,13 +483,28 @@ start_transaction(struct btrfs_root *root, unsigned int num_items,
* the appropriate flushing if need be.
*/
if (num_items && root != fs_info->chunk_root) {
+ struct btrfs_block_rsv *rsv = &fs_info->trans_block_rsv;
+ u64 delayed_refs_bytes = 0;
+
qgroup_reserved = num_items * fs_info->nodesize;
ret = btrfs_qgroup_reserve_meta_pertrans(root, qgroup_reserved,
enforce_qgroups);
if (ret)
return ERR_PTR(ret);
+ /*
+ * We want to reserve all the bytes we may need all at once, so
+ * we only do 1 enospc flushing cycle per transaction start. We
+ * accomplish this by simply assuming we'll do 2 x num_items
+ * worth of delayed refs updates in this trans handle, and
+ * refill that amount for whatever is missing in the reserve.
+ */
num_bytes = btrfs_calc_trans_metadata_size(fs_info, num_items);
+ if (delayed_refs_rsv->full == 0) {
+ delayed_refs_bytes = num_bytes;
+ num_bytes <<= 1;
+ }
+
/*
* Do the reservation for the relocation root creation
*/
@@ -498,8 +513,24 @@ start_transaction(struct btrfs_root *root, unsigned int num_items,
reloc_reserved = true;
}
- ret = btrfs_block_rsv_add(root, &fs_info->trans_block_rsv,
- num_bytes, flush);
+ ret = btrfs_block_rsv_add(root, rsv, num_bytes, flush);
+ if (ret)
+ goto reserve_fail;
+ if (delayed_refs_bytes) {
+ btrfs_migrate_to_delayed_refs_rsv(fs_info, rsv,
+ delayed_refs_bytes);
+ num_bytes -= delayed_refs_bytes;
+ }
+ } else if (num_items == 0 && flush == BTRFS_RESERVE_FLUSH_ALL &&
+ !delayed_refs_rsv->full) {
+ /*
+ * Some people call with btrfs_start_transaction(root, 0)
+ * because they can be throttled, but have some other mechanism
+ * for reserving space. We still want these guys to refill the
+ * delayed block_rsv so just add 1 items worth of reservation
+ * here.
+ */
+ ret = btrfs_delayed_refs_rsv_refill(fs_info, flush);
if (ret)
goto reserve_fail;
}