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Btrfs: fix the race between bio and btrfs_stop_workers

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open_ctree() need read the metadata to initialize the global information
of btrfs. But it may fail after it submit some bio, and then it will jump
to the error path. Unfortunately, it doesn't check if there are some bios
in flight, and just stop all the worker threads. As a result, when the
submitted bios end, they can not find any worker thread which can deal with
subsequent work, then oops happen.

kernel BUG at fs/btrfs/async-thread.c:605!

Fix this problem by invoking invalidate_inode_pages2() before we stop the
worker threads. This function will wait until the bio end because it need
lock the pages which are going to be invalidated, and if a page is under
disk read IO, it must be locked. invalidate_inode_pages2() need wait until
end bio handler to unlocked it.

Reported-and-Tested-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Miao Xie 2013-02-07 06:01:35 +00:00 committed by Josef Bacik
parent cb95e7bf7b
commit 2b8195bb57
1 changed files with 1 additions and 2 deletions
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3
fs/btrfs/disk-io.c
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@ -2711,13 +2711,13 @@ int open_ctree(struct super_block *sb,
* kthreads
*/
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
fail_block_groups:
btrfs_free_block_groups(fs_info);
fail_tree_roots:
free_root_pointers(fs_info, 1);
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
fail_sb_buffer:
btrfs_stop_workers(&fs_info->generic_worker);
@ -2738,7 +2738,6 @@ int open_ctree(struct super_block *sb,
fail_iput:
btrfs_mapping_tree_free(&fs_info->mapping_tree);
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
iput(fs_info->btree_inode);
fail_delalloc_bytes:
percpu_counter_destroy(&fs_info->delalloc_bytes);