This remove the unnessary BUG_ON if the allocation with
alloc_extent_state_atomic fails due to this function
failure not being unrecoverable. Instead we now change
this BUG_ON into a new error path that jumps to the goto
label, out from freeing previously allocated resources
before returning the error code -ENOMEM to signal callers
that the call to __clear_extent_bit failed due to a memory
allocation failure.
Signed-off-by: Bastien Philbert <bastienphilbert@xxxxxxxxx>
---
fs/btrfs/extent_io.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d247fc0..4c87b77 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -682,7 +682,10 @@ hit_next:
if (state->start < start) {
prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
err = split_state(tree, state, prealloc, start);
if (err)
extent_io_tree_panic(tree, err);
--
2.5.0
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