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

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commit de348ee022 upstream.

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: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wang Shilong
2014-04-09 19:23:22 +08:00
committed by Greg Kroah-Hartman
parent 7df26ca1d8
commit add81375ec
1 changed files with 5 additions and 0 deletions
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5
fs/btrfs/disk-io.c
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@@ -3633,6 +3633,11 @@ int close_ctree(struct btrfs_root *root)
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);
free_root_pointers(fs_info, 1);