From 14ae4ec1ee1466b701e0518f9acbb0bbd8ab0684 Mon Sep 17 00:00:00 2001 From: Qu Wenruo Date: Fri, 10 May 2019 12:45:05 +0800 Subject: btrfs: extent-tree: Fix a bug that btrfs is unable to add pinned bytes Commit ddf30cf03fb5 ("btrfs: extent-tree: Use btrfs_ref to refactor add_pinned_bytes()") refactored add_pinned_bytes(), but during that refactor, there are two callers which add the pinned bytes instead of subtracting. That refactor misses those two caller, causing incorrect pinned bytes calculation and resulting unexpected ENOSPC error. Fix it by adding a new parameter @sign to restore the original behavior. Reported-by: kernel test robot Fixes: ddf30cf03fb5 ("btrfs: extent-tree: Use btrfs_ref to refactor add_pinned_bytes()") Signed-off-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/extent-tree.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) (limited to 'fs/btrfs') diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9bcb3570750e..1aee51a9f3bf 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -757,12 +757,14 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info, } static void add_pinned_bytes(struct btrfs_fs_info *fs_info, - struct btrfs_ref *ref) + struct btrfs_ref *ref, int sign) { struct btrfs_space_info *space_info; - s64 num_bytes = -ref->len; + s64 num_bytes; u64 flags; + ASSERT(sign == 1 || sign == -1); + num_bytes = sign * ref->len; if (ref->type == BTRFS_REF_METADATA) { if (ref->tree_ref.root == BTRFS_CHUNK_TREE_OBJECTID) flags = BTRFS_BLOCK_GROUP_SYSTEM; @@ -2063,7 +2065,7 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans, btrfs_ref_tree_mod(fs_info, generic_ref); if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) - add_pinned_bytes(fs_info, generic_ref); + add_pinned_bytes(fs_info, generic_ref, -1); return ret; } @@ -7189,7 +7191,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans, } out: if (pin) - add_pinned_bytes(fs_info, &generic_ref); + add_pinned_bytes(fs_info, &generic_ref, 1); if (last_ref) { /* @@ -7237,7 +7239,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_ref *ref) btrfs_ref_tree_mod(fs_info, ref); if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) - add_pinned_bytes(fs_info, ref); + add_pinned_bytes(fs_info, ref, 1); return ret; } -- cgit v1.2.3