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Merge tag 'for-5.3-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux

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Pull btrfs fixes from David Sterba:
 "Two regression fixes:

   - hangs caused by a missing barrier in the locking code

   - memory leaks of extent_state due to bad handling of a cached
     pointer"

* tag 'for-5.3-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
  btrfs: fix extent_state leak in btrfs_lock_and_flush_ordered_range
  btrfs: Fix deadlock caused by missing memory barrier
This commit is contained in:
Linus Torvalds
2019-07-26 11:08:37 -07:00
parent 863fa8887b a3b46b86ca
commit 4792ba1f1f
2 changed files with 12 additions and 8 deletions
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9
fs/btrfs/locking.c
View File

@@ -346,9 +346,12 @@ void btrfs_tree_unlock(struct extent_buffer *eb)
if (blockers) {
btrfs_assert_no_spinning_writers(eb);
eb->blocking_writers--;
/* Use the lighter barrier after atomic */
smp_mb__after_atomic();
cond_wake_up_nomb(&eb->write_lock_wq);
/*
* We need to order modifying blocking_writers above with
* actually waking up the sleepers to ensure they see the
* updated value of blocking_writers
*/
cond_wake_up(&eb->write_lock_wq);
} else {
btrfs_assert_spinning_writers_put(eb);
write_unlock(&eb->lock);

11
fs/btrfs/ordered-data.c
View File

@@ -985,13 +985,14 @@ void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree,
struct extent_state **cached_state)
{
struct btrfs_ordered_extent *ordered;
struct extent_state *cachedp = NULL;
struct extent_state *cache = NULL;
struct extent_state **cachedp = &cache;
if (cached_state)
cachedp = *cached_state;
cachedp = cached_state;
while (1) {
lock_extent_bits(tree, start, end, &cachedp);
lock_extent_bits(tree, start, end, cachedp);
ordered = btrfs_lookup_ordered_range(inode, start,
end - start + 1);
if (!ordered) {
@@ -1001,10 +1002,10 @@ void btrfs_lock_and_flush_ordered_range(struct extent_io_tree *tree,
* aren't exposing it outside of this function
*/
if (!cached_state)
refcount_dec(&cachedp->refs);
refcount_dec(&cache->refs);
break;
}
unlock_extent_cached(tree, start, end, &cachedp);
unlock_extent_cached(tree, start, end, cachedp);
btrfs_start_ordered_extent(&inode->vfs_inode, ordered, 1);
btrfs_put_ordered_extent(ordered);
}