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| author | Thomas Gleixner <tglx@linutronix.de> | 2018-03-14 20:37:31 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-03-14 20:37:31 +0100 |
| commit | b0d8bef8ed805ca92eb91e86acf3ce89cbebc8ce (patch) | |
| tree | 8838391a76f0cf75ffcd31166996d03d19c580a6 /fs/btrfs/backref.c | |
| parent | 82b691bedf05f258f1c86c96ee574b0d7795c0a1 (diff) | |
| parent | fc6eabbbf8ef99efed778dd5afabc83c21dba585 (diff) | |
| download | blackbird-op-linux-b0d8bef8ed805ca92eb91e86acf3ce89cbebc8ce.tar.gz blackbird-op-linux-b0d8bef8ed805ca92eb91e86acf3ce89cbebc8ce.zip | |
Merge branch 'linus' into irq/core to pick up dependencies.
Diffstat (limited to 'fs/btrfs/backref.c')
| -rw-r--r-- | fs/btrfs/backref.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index e4054e533f6d..f94b2d8c744a 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1264,7 +1264,16 @@ again: while (node) { ref = rb_entry(node, struct prelim_ref, rbnode); node = rb_next(&ref->rbnode); - WARN_ON(ref->count < 0); + /* + * ref->count < 0 can happen here if there are delayed + * refs with a node->action of BTRFS_DROP_DELAYED_REF. + * prelim_ref_insert() relies on this when merging + * identical refs to keep the overall count correct. + * prelim_ref_insert() will merge only those refs + * which compare identically. Any refs having + * e.g. different offsets would not be merged, + * and would retain their original ref->count < 0. + */ if (roots && ref->count && ref->root_id && ref->parent == 0) { if (sc && sc->root_objectid && ref->root_id != sc->root_objectid) { |
