1 files changed, 23 insertions, 17 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e2287c7c10be..53e12977bfd0 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -4838,7 +4838,7 @@ static inline int need_do_async_reclaim(struct btrfs_space_info *space_info,
         u64 thresh = div_factor_fine(space_info->total_bytes, 98);
 
         /* If we're just plain full then async reclaim just slows us down. */
-        if (space_info->bytes_used >= thresh)
+        if ((space_info->bytes_used + space_info->bytes_reserved) >= thresh)
                 return 0;
 
         return (used >= thresh && !btrfs_fs_closing(fs_info) &&
@@ -5373,27 +5373,33 @@ static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
 
         block_rsv->size = min_t(u64, num_bytes, SZ_512M);
 
-        num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +
-                    sinfo->bytes_reserved + sinfo->bytes_readonly +
-                    sinfo->bytes_may_use;
-
-        if (sinfo->total_bytes > num_bytes) {
-                num_bytes = sinfo->total_bytes - num_bytes;
-                block_rsv->reserved += num_bytes;
-                sinfo->bytes_may_use += num_bytes;
-                trace_btrfs_space_reservation(fs_info, "space_info",
-                                      sinfo->flags, num_bytes, 1);
-        }
-
-        if (block_rsv->reserved >= block_rsv->size) {
+        if (block_rsv->reserved < block_rsv->size) {
+                num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +
+                        sinfo->bytes_reserved + sinfo->bytes_readonly +
+                        sinfo->bytes_may_use;
+                if (sinfo->total_bytes > num_bytes) {
+                        num_bytes = sinfo->total_bytes - num_bytes;
+                        num_bytes = min(num_bytes,
+                                        block_rsv->size - block_rsv->reserved);
+                        block_rsv->reserved += num_bytes;
+                        sinfo->bytes_may_use += num_bytes;
+                        trace_btrfs_space_reservation(fs_info, "space_info",
+                                                      sinfo->flags, num_bytes,
+                                                      1);
+                }
+        } else if (block_rsv->reserved > block_rsv->size) {
                 num_bytes = block_rsv->reserved - block_rsv->size;
                 sinfo->bytes_may_use -= num_bytes;
                 trace_btrfs_space_reservation(fs_info, "space_info",
                                       sinfo->flags, num_bytes, 0);
                 block_rsv->reserved = block_rsv->size;
-                block_rsv->full = 1;
         }
 
+        if (block_rsv->reserved == block_rsv->size)
+                block_rsv->full = 1;
+        else
+                block_rsv->full = 0;
+
         spin_unlock(&block_rsv->lock);
         spin_unlock(&sinfo->lock);
 }
@@ -5752,7 +5758,7 @@ out_fail:
 
                 /*
                  * This is tricky, but first we need to figure out how much we
-                 * free'd from any free-ers that occured during this
+                 * free'd from any free-ers that occurred during this
                  * reservation, so we reset ->csum_bytes to the csum_bytes
                  * before we dropped our lock, and then call the free for the
                  * number of bytes that were freed while we were trying our
@@ -7018,7 +7024,7 @@ btrfs_lock_cluster(struct btrfs_block_group_cache *block_group,
                    struct btrfs_free_cluster *cluster,
                    int delalloc)
 {
-        struct btrfs_block_group_cache *used_bg;
+        struct btrfs_block_group_cache *used_bg = NULL;
         bool locked = false;
 again:
         spin_lock(&cluster->refill_lock);