diff options
| -rw-r--r-- | fs/btrfs/extent-tree.c | 71 |
1 files changed, 42 insertions, 29 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 06369d588f27..a8de1c30f21c 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3663,6 +3663,46 @@ out: return ret; } +static int can_overcommit(struct btrfs_root *root, + struct btrfs_space_info *space_info, u64 bytes, + int flush) +{ + u64 profile = btrfs_get_alloc_profile(root, 0); + u64 avail; + u64 used; + + used = space_info->bytes_used + space_info->bytes_reserved + + space_info->bytes_pinned + space_info->bytes_readonly + + space_info->bytes_may_use; + + spin_lock(&root->fs_info->free_chunk_lock); + avail = root->fs_info->free_chunk_space; + spin_unlock(&root->fs_info->free_chunk_lock); + + /* + * If we have dup, raid1 or raid10 then only half of the free + * space is actually useable. + */ + if (profile & (BTRFS_BLOCK_GROUP_DUP | + BTRFS_BLOCK_GROUP_RAID1 | + BTRFS_BLOCK_GROUP_RAID10)) + avail >>= 1; + + /* + * If we aren't flushing don't let us overcommit too much, say + * 1/8th of the space. If we can flush, let it overcommit up to + * 1/2 of the space. + */ + if (flush) + avail >>= 3; + else + avail >>= 1; + + if (used + bytes < space_info->total_bytes + avail) + return 1; + return 0; +} + /* * shrink metadata reservation for delalloc */ @@ -3705,10 +3745,7 @@ static void shrink_delalloc(struct btrfs_root *root, u64 to_reclaim, u64 orig, !atomic_read(&root->fs_info->async_delalloc_pages)); spin_lock(&space_info->lock); - if (space_info->bytes_used + space_info->bytes_reserved + - space_info->bytes_pinned + space_info->bytes_readonly + - space_info->bytes_may_use + orig <= - space_info->total_bytes) { + if (can_overcommit(root, space_info, orig, !trans)) { spin_unlock(&space_info->lock); break; } @@ -3924,7 +3961,6 @@ again: } if (ret) { - u64 profile = btrfs_get_alloc_profile(root, 0); u64 avail; /* @@ -3945,30 +3981,7 @@ again: goto again; } - spin_lock(&root->fs_info->free_chunk_lock); - avail = root->fs_info->free_chunk_space; - - /* - * If we have dup, raid1 or raid10 then only half of the free - * space is actually useable. - */ - if (profile & (BTRFS_BLOCK_GROUP_DUP | - BTRFS_BLOCK_GROUP_RAID1 | - BTRFS_BLOCK_GROUP_RAID10)) - avail >>= 1; - - /* - * If we aren't flushing don't let us overcommit too much, say - * 1/8th of the space. If we can flush, let it overcommit up to - * 1/2 of the space. - */ - if (flush) - avail >>= 3; - else - avail >>= 1; - spin_unlock(&root->fs_info->free_chunk_lock); - - if (used + num_bytes < space_info->total_bytes + avail) { + if (can_overcommit(root, space_info, orig_bytes, flush)) { space_info->bytes_may_use += orig_bytes; trace_btrfs_space_reservation(root->fs_info, "space_info", space_info->flags, orig_bytes, 1); |
