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btrfs: don't get an EINTR during drop_snapshot for reloc 

This was partially fixed by f3e3d9cc35 ("btrfs: avoid possible signal
interruption of btrfs_drop_snapshot() on relocation tree"), however it
missed a spot when we restart a trans handle because we need to end the
transaction.  The fix is the same, simply use btrfs_join_transaction()
instead of btrfs_start_transaction() when deleting reloc roots.

Fixes: f3e3d9cc35 ("btrfs: avoid possible signal interruption of btrfs_drop_snapshot() on relocation tree")
CC: stable@vger.kernel.org # 5.4+
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-12-16 11:22:05 -05:00 committed by David Sterba
parent 518837e650
commit 18d3bff411
1 changed files with 9 additions and 1 deletions
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10
fs/btrfs/extent-tree.c
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@ -5549,7 +5549,15 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref, int for_reloc)
goto out_free;
}
trans = btrfs_start_transaction(tree_root, 0);
/*
* Use join to avoid potential EINTR from transaction
* start. See wait_reserve_ticket and the whole
* reservation callchain.
*/
if (for_reloc)
trans = btrfs_join_transaction(tree_root);
else
trans = btrfs_start_transaction(tree_root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto out_free;