Btrfs: kill the durable block rsv stuff

[firefly-linux-kernel-4.4.55.git] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4add1ac2dda0b21b90e6ee45d4bdeaf64bb97ecd..30c0558eae845fee8078988af186b800b1917179 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -121,7 +121,6 @@ void btrfs_put_block_group(struct btrfs_block_group_cache *cache)
        if (atomic_dec_and_test(&cache->count)) {
                WARN_ON(cache->pinned > 0);
                WARN_ON(cache->reserved > 0);
-               WARN_ON(cache->reserved_pinned > 0);
                kfree(cache->free_space_ctl);
                kfree(cache);
        }
@@ -3662,7 +3661,6 @@ void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv)
        spin_lock_init(&rsv->lock);
        atomic_set(&rsv->usage, 1);
        rsv->priority = 6;
-       INIT_LIST_HEAD(&rsv->list);
 }
 
 struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root)
@@ -3685,25 +3683,10 @@ void btrfs_free_block_rsv(struct btrfs_root *root,
 {
        if (rsv && atomic_dec_and_test(&rsv->usage)) {
                btrfs_block_rsv_release(root, rsv, (u64)-1);
-               if (!rsv->durable)
-                       kfree(rsv);
+               kfree(rsv);
        }
 }
 
-/*
- * make the block_rsv struct be able to capture freed space.
- * the captured space will re-add to the the block_rsv struct
- * after transaction commit
- */
-void btrfs_add_durable_block_rsv(struct btrfs_fs_info *fs_info,
-                                struct btrfs_block_rsv *block_rsv)
-{
-       block_rsv->durable = 1;
-       mutex_lock(&fs_info->durable_block_rsv_mutex);
-       list_add_tail(&block_rsv->list, &fs_info->durable_block_rsv_list);
-       mutex_unlock(&fs_info->durable_block_rsv_mutex);
-}
-
 int btrfs_block_rsv_add(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root,
                        struct btrfs_block_rsv *block_rsv,
@@ -3745,9 +3728,7 @@ int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
                ret = 0;
        } else {
                num_bytes -= block_rsv->reserved;
-               if (block_rsv->durable &&
-                   block_rsv->freed[0] + block_rsv->freed[1] >= num_bytes)
-                       commit_trans = 1;
+               commit_trans = 1;
        }
        spin_unlock(&block_rsv->lock);
        if (!ret)
@@ -3763,8 +3744,18 @@ int btrfs_block_rsv_check(struct btrfs_trans_handle *trans,
        }
 
        if (commit_trans) {
+               struct btrfs_space_info *sinfo = block_rsv->space_info;
+
                if (trans)
                        return -EAGAIN;
+
+               spin_lock(&sinfo->lock);
+               if (sinfo->bytes_pinned < num_bytes) {
+                       spin_unlock(&sinfo->lock);
+                       return -ENOSPC;
+               }
+               spin_unlock(&sinfo->lock);
+
                trans = btrfs_join_transaction(root);
                BUG_ON(IS_ERR(trans));
                ret = btrfs_commit_transaction(trans, root);
@@ -3885,10 +3876,6 @@ static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
        fs_info->tree_root->block_rsv = &fs_info->global_block_rsv;
        fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
 
-       btrfs_add_durable_block_rsv(fs_info, &fs_info->global_block_rsv);
-
-       btrfs_add_durable_block_rsv(fs_info, &fs_info->delalloc_block_rsv);
-
        update_global_block_rsv(fs_info);
 }
 
@@ -4447,13 +4434,8 @@ static int unpin_extent_range(struct btrfs_root *root, u64 start, u64 end)
                spin_lock(&cache->lock);
                cache->pinned -= len;
                cache->space_info->bytes_pinned -= len;
-               if (cache->ro) {
+               if (cache->ro)
                        cache->space_info->bytes_readonly += len;
-               } else if (cache->reserved_pinned > 0) {
-                       len = min(len, cache->reserved_pinned);
-                       cache->reserved_pinned -= len;
-                       cache->space_info->bytes_may_use += len;
-               }
                spin_unlock(&cache->lock);
                spin_unlock(&cache->space_info->lock);
        }
@@ -4468,11 +4450,8 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
 {
        struct btrfs_fs_info *fs_info = root->fs_info;
        struct extent_io_tree *unpin;
-       struct btrfs_block_rsv *block_rsv;
-       struct btrfs_block_rsv *next_rsv;
        u64 start;
        u64 end;
-       int idx;
        int ret;
 
        if (fs_info->pinned_extents == &fs_info->freed_extents[0])
@@ -4495,30 +4474,6 @@ int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
                cond_resched();
        }
 
-       mutex_lock(&fs_info->durable_block_rsv_mutex);
-       list_for_each_entry_safe(block_rsv, next_rsv,
-                                &fs_info->durable_block_rsv_list, list) {
-
-               idx = trans->transid & 0x1;
-               if (block_rsv->freed[idx] > 0) {
-                       block_rsv_add_bytes(block_rsv,
-                                           block_rsv->freed[idx], 0);
-                       block_rsv->freed[idx] = 0;
-               }
-               if (atomic_read(&block_rsv->usage) == 0) {
-                       btrfs_block_rsv_release(root, block_rsv, (u64)-1);
-
-                       if (block_rsv->freed[0] == 0 &&
-                           block_rsv->freed[1] == 0) {
-                               list_del_init(&block_rsv->list);
-                               kfree(block_rsv);
-                       }
-               } else {
-                       btrfs_block_rsv_release(root, block_rsv, 0);
-               }
-       }
-       mutex_unlock(&fs_info->durable_block_rsv_mutex);
-
        return 0;
 }
 
@@ -4820,36 +4775,18 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
                if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) {
                        ret = check_ref_cleanup(trans, root, buf->start);
                        if (!ret)
-                               goto pin;
+                               goto out;
                }
 
                if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
                        pin_down_extent(root, cache, buf->start, buf->len, 1);
-                       goto pin;
+                       goto out;
                }
 
                WARN_ON(test_bit(EXTENT_BUFFER_DIRTY, &buf->bflags));
 
                btrfs_add_free_space(cache, buf->start, buf->len);
                btrfs_update_reserved_bytes(cache, buf->len, RESERVE_FREE);
-
-               goto out;
-       }
-pin:
-       if (block_rsv->durable && !cache->ro) {
-               ret = 0;
-               spin_lock(&cache->lock);
-               if (!cache->ro) {
-                       cache->reserved_pinned += buf->len;
-                       ret = 1;
-               }
-               spin_unlock(&cache->lock);
-
-               if (ret) {
-                       spin_lock(&block_rsv->lock);
-                       block_rsv->freed[trans->transid & 0x1] += buf->len;
-                       spin_unlock(&block_rsv->lock);
-               }
        }
 out:
        /*
@@ -6705,12 +6642,9 @@ static int set_block_group_ro(struct btrfs_block_group_cache *cache, int force)
                    cache->bytes_super - btrfs_block_group_used(&cache->item);
 
        if (sinfo->bytes_used + sinfo->bytes_reserved + sinfo->bytes_pinned +
-           sinfo->bytes_may_use + sinfo->bytes_readonly +
-           cache->reserved_pinned + num_bytes + min_allocable_bytes <=
-           sinfo->total_bytes) {
+           sinfo->bytes_may_use + sinfo->bytes_readonly + num_bytes +
+           min_allocable_bytes <= sinfo->total_bytes) {
                sinfo->bytes_readonly += num_bytes;
-               sinfo->bytes_may_use += cache->reserved_pinned;
-               cache->reserved_pinned = 0;
                cache->ro = 1;
                ret = 0;
        }