From: Edmund Nadolski <enadolski@suse.com>
Date: Wed, 12 Jul 2017 22:20:09 +0000 (-0600)
Subject: btrfs: add cond_resched() calls when resolving backrefs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9dd14fd6964e6db02346d5f472f915029728b8cf;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

btrfs: add cond_resched() calls when resolving backrefs

Since backref resolution is CPU-intensive, the cond_resched calls
should help alleviate soft lockup occurences.

Signed-off-by: Edmund Nadolski <enadolski@suse.com>
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 4cda81964dd4..9593102bdc2c 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -660,6 +660,7 @@ static int resolve_indirect_refs(struct btrfs_fs_info *fs_info,
 		prelim_ref_insert(fs_info, &preftrees->direct, ref);
 
 		ulist_reinit(parents);
+		cond_resched();
 	}
 out:
 	ulist_free(parents);
@@ -702,6 +703,7 @@ static int add_missing_keys(struct btrfs_fs_info *fs_info,
 		btrfs_tree_read_unlock(eb);
 		free_extent_buffer(eb);
 		prelim_ref_insert(fs_info, &preftrees->indirect, ref);
+		cond_resched();
 	}
 	return 0;
 }
@@ -1243,6 +1245,7 @@ again:
 			}
 			eie = NULL;
 		}
+		cond_resched();
 	}
 
 out: