Commit de348ee0 authored by Wang Shilong's avatar Wang Shilong Committed by Chris Mason

Btrfs: make sure there are not any read requests before stopping workers

In close_ctree(), after we have stopped all workers,there maybe still
some read requests(for example readahead) to submit and this *maybe* trigger
an oops that user reported before:

kernel BUG at fs/btrfs/async-thread.c:619!

By hacking codes, i can reproduce this problem with one cpu available.
We fix this potential problem by invalidating all btree inode pages before
stopping all workers.

Thanks to Miao for pointing out this problem.
Signed-off-by: default avatarWang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.cz>
Signed-off-by: default avatarChris Mason <clm@fb.com>
parent 59885b39
...@@ -3657,6 +3657,11 @@ int close_ctree(struct btrfs_root *root) ...@@ -3657,6 +3657,11 @@ int close_ctree(struct btrfs_root *root)
btrfs_free_block_groups(fs_info); btrfs_free_block_groups(fs_info);
/*
* we must make sure there is not any read request to
* submit after we stopping all workers.
*/
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
btrfs_stop_all_workers(fs_info); btrfs_stop_all_workers(fs_info);
free_root_pointers(fs_info, 1); free_root_pointers(fs_info, 1);
......
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