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btrfs: Fix possible softlock on single core machines
do_chunk_alloc implements a loop checking whether there is a pending
chunk allocation and if so causes the caller do loop. Generally this
loop is executed only once, however testing with btrfs/072 on a single
core vm machines uncovered an extreme case where the system could loop
indefinitely. This is due to a missing cond_resched when loop which
doesn't give a chance to the previous chunk allocator finish its job.
The fix is to simply add the missing cond_resched.
Fixes: 6d74119f1a
("Btrfs: avoid taking the chunk_mutex in do_chunk_alloc")
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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@ -4643,6 +4643,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
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if (wait_for_alloc) {
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mutex_unlock(&fs_info->chunk_mutex);
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wait_for_alloc = 0;
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cond_resched();
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goto again;
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}
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