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btrfs: relocation: allow signal to cancel balance 

Although btrfs balance can be canceled with "btrfs balance cancel"
command, it's still almost muscle memory to press Ctrl-C to cancel a
long running btrfs balance.

So allow btrfs balance to check signal to determine if it should exit.
The cancellation points are in known location and we're only adding one
more reason, so this should be safe.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-07-13 09:03:19 +08:00 committed by David Sterba
parent 813f8a0e26
commit 5cb502f4ab
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/relocation.c
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@ -2656,7 +2656,8 @@ int setup_extent_mapping(struct inode *inode, u64 start, u64 end,
*/
int btrfs_should_cancel_balance(struct btrfs_fs_info *fs_info)
{
return atomic_read(&fs_info->balance_cancel_req);
return atomic_read(&fs_info->balance_cancel_req) ||
fatal_signal_pending(current);
}
ALLOW_ERROR_INJECTION(btrfs_should_cancel_balance, TRUE);